2004 Chevy Impala heater core removal and installation

Tiny
BRIAN61969
  • 2004 CHEVROLET IMPALA

Heater problem
2004 Chevy Impala 6 cyl Front Wheel Drive Automatic 70,000 miles

how do you remove a heater core on a
2004 Impala SS 3.8l v6.

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Sunday, February 8th, 2009 AT 10:42 AM

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Tiny
2CARPROS KEN
  • ADMIN
  • 4,959 POSTS

Hey BRIAN,

Doing a heater core is a big job but you can tackle it if you just stick to it. Here are some instructions and a diagram or two to help you through the job.

Remove the fuel injector sight shield.

Drain the cooling system. Refer to Draining and Filling Cooling System in Cooling System.
Use J 38185 in order to position aside the heater hose inlet and outlet clamps at the heater core.
Disconnect the inlet and outlet heater hose from the heater core.
Remove the RH Instrument Panel Closeout/Insulator panel.
Remove the LH Instrument Panel Closeout/Insulator panel
Remove the floor carpet.
Remove the rear floor air outlet duct from the holes in the floor reinforcement.
Disconnect the rear floor air outlet duct from the heater air outlet cover.
Remove the rear floor air outlet duct.
Remove the heater air outlet cover screws (2).
Remove the heater air outlet cover heat stakes (1) with a small chisel.
Remove the heater air outlet cover from the HVAC module assembly.
Remove the heater core cover screws (2).
Remove the heater core cover heat stakes (1) with a small chisel.
Remove the heater core cover from the HVAC module assembly.
Remove the heater core from the HVAC module assembly.
Remove the heater core foam seal (1) from the HVAC module assembly.

Please let us know happens so it will help others.

Best, Ken

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Monday, December 12th, 2016 AT 5:35 PM
Tiny
THOMAS DAVIS
  • CHEVROLET IMPALA
  • MERGED

I have a 2004 impala with 85000 miles on it the car has a 3.4 liter engine and the heater core is leaking. Well I really need to know how to take the heater core out.

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Monday, December 12th, 2016 AT 5:43 PM
Tiny
BLACKOP555
  • EXPERT
  • 10,553 POSTS
  • MERGED

Yes first drain the coolant system and then take off the heater core hoses at the fire wall. NExt dissasemble the dash and you should find a pannel that removes somewhere on the air ducts that will come off to show you the heater core.

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Monday, December 12th, 2016 AT 5:43 PM
Tiny
EVSD1432
  • 2004 CHEVROLET IMPALA
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 109,000 MILES
  • MERGED

Leaks coming out of heater core

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Monday, December 12th, 2016 AT 5:43 PM
Tiny
CARADIODOC
  • EXPERT
  • 26,419 POSTS
  • MERGED

That is a huge job that requires discharging the air conditioning system. If you're okay with spending a couple of days, get a copy of the manufacturer's service manual. The procedure covers many pages. Don't use a Chilton's or Haynes manual. Those only list jobs that can be handled by do-it-yourselfers. They aren't likely to include this procedure.

To prevent future leaks, consider getting the red Dex-Cool, ("Dex-Mud") coolant out of there and use something else, and be sure to replace it every two years. Acids form in it that lead to corroded heater cores and radiators.

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Monday, December 12th, 2016 AT 5:43 PM
Tiny
WILLIAMSRAYH
  • 2006 CHEVROLET IMPALA
  • MERGED

Heater problem
2006 Chevy Impala 6 cyl Front Wheel Drive Automatic 73036 miles

Do you have to remove the dash panel to
replace the heater core?

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Wednesday, December 21st, 2016 AT 6:27 PM
Tiny
KEVIN12881
  • MEMBER
  • MERGED

Heater core is located under the dash on passenger side. Should be able to remove some kick plates, though they may prove a little difficult. May also want to take out passenger seat so you have room to work. Are you sure your heater core is bad at 73k?

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Wednesday, December 21st, 2016 AT 6:27 PM
Tiny
DAVIDWWALKERSR
  • MEMBER
  • MERGED

Car is running above halfway mark often
There is some gook in radiator
Would flushing radiator help?

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Wednesday, December 21st, 2016 AT 6:27 PM
Tiny
LARRYJR6720
  • 2005 CHEVROLET IMPALA
  • MERGED

Engine Cooling problem
2005 Chevy Impala 6 cyl Front Wheel Drive Automatic 102000 miles

I have a 2005 chevy impala im trying to take the housing off so I can remove the heater core. I have the bolt off the houseing but it still will not come off. What am I missing? Can u help

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Wednesday, December 21st, 2016 AT 6:27 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
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REMOVAL:
Disconnect the negative battery cable.
If equipped with a 3.1L engine, remove the air cleaner and duct assembly.
If equipped with a 3.8L engine, remove the fuel injector sight shield by performing the following procedures:
Clean the area around the oil filler cap/tube assembly location.
Rotate the oil filler cap/tube assembly counterclockwise from the valve cover.
Lift the fuel injector sight shield up at the front and slide it from the rear engine bracket.
Reinstall the oil filler cap/tube assembly in the valve cover.

CAUTION
Before draining the cooling system, allow the engine to cool to relieve the systems internal pressure and to avoid scalding coolant.

Drain the cooling system by performing the following procedure:
Raise and safely support the front of the vehicle.
Remove and clean the coolant recovery tank.
Place a 2 gallon pan under the radiator to catch the coolant.
At the bottom of the radiator, open the drain valve and drain the coolant to a level lower than the heater core.
Remove the radiator cap and open the air bleed screw (2-3 turns) located on top of the thermostat housing.
After sufficient coolant has been drained from the system, close the drain valve.

CAUTION
Engine coolant is a hazardous waste; it should be stored for reuse or submitted for recycling. NEVER dispose of it by dumping it into the environment.

Disconnect and plug the heater hoses at the heater core.
If equipped, remove the lower center console by removing or disconnecting the following:

Cigarette lighter
Automatic transaxle shift handle
Upper console trim plate from the front floor console by unsnapping it
Electrical connectors from the upper console trim plate and remove the trim plate
CD storage compartment from the front floor console by unsnapping it
Raise the front floor console armrest and remove the compartment mat
Console-to-chassis bolts and screws
Electrical connectors from the console and remove the console from the vehicle

Remove the lower instrument panel lower compartment by removing or disconnecting the following:

Lower right instrument panel insulator
Compartment-to-panel bolts and screws, from under the instrument panel compartment
Instrument panel compartment door screws and the door
Instrument panel compartment screws and plastic clips; then slide the compartment from the instrument panel
Electrical connector from the compartment
Ashtray and bracket, if necessary
Lower heater duct
Heater core cover and discard the cover seals Heater core mounting clip and bracket
Heater core

INSTALLATION:
Install and connect the following:

Heater core in the vehicle
Heater core mounting clip and bracket
New seals on the heater core cover
Heater core cover and torque the bolts to 13 inch lbs. (1.5 Nm)
Lower heater duct, if removed
Ashtray and bracket, if removed

Install the lower instrument panel lower by installing or connecting the following:

Electrical connector to the compartment
Slide the compartment into the instrument panel; then, secure it with screws and plastic clips Instrument panel compartment door and screws Compartment-to-panel bolts and screws, located under the instrument panel compartment
Lower right instrument panel insulator

If equipped, install the lower center console install or connect the following:

Console in the vehicle and connect the electrical connectors
Console-to-chassis bolts and screws, tighten in sequence beginning at the front right and continue in a clockwise order to 106 inch lbs. (12 Nm) Armrest compartment mat and lower the front floor console armrest C/D storage compartment into the front floor console
Electrical connectors to the upper console trim plate and snap the trim plate onto the console
Automatic transaxle shift handle and the cigarette lighter
Heater hoses to the heater core and secure with the clamps

Refill the cooling system by performing the following procedure:
Close the radiator drain valve.
If the air bleed screws (located at the top of the thermostat housing) is closed, open it by turning it 2-3 turns.
Slowly add coolant until it reaches the radiator neck.
Wait for 2 minutes and recheck the coolant level; then, add more coolant if necessary.
Fill the coolant reservoir to the COLD mark.
Close the air bleed screw.
WARNING
Do not over-tighten the air bleed screw for it is made of brass.

Install the radiator cap and make sure that the arrows align with the overflow tube.

If equipped with a 3.8L engine, install the fuel injector sight shield by performing the following procedures:
Remove the oil filler cap/tube assembly from the valve cover.
Slide the fuel injector sight shield into the rear engine bracket and lower it into place.
Reinstall the oil filler cap/tube assembly in the valve cover. Twist it clockwise to lock the detent on the tube into the notch in the valve cover.

If equipped with a 3.1L engine, install the air cleaner and duct assembly.
Connect the negative battery cable.

Thanks for using 2CarPros. Com!

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Wednesday, December 21st, 2016 AT 6:27 PM

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